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Mechanics pls

1.
How much can we learn about the turbulence of
fluids from the motions of tiny particles?
When investigating fluids, researchers introduce “fluid tracers” into the
fluid and track their movement to visualize the fluid’s motion; particles with
very low inertia such as air bubbles have been assumed to make good
tracers. This assumption, however, is now called into question by a study
that demonstrated that using lightweight particles as tracers is not always
a good idea, and that gravity has a significant effect on how tracers
behave. The researchers of this study also devised a mathematical model
to explain how the acceleration of particles in a turbulent fluid is affected
by factors such as gravity.
What this study found calls for a change in methodology when using
tracers. It questions the assumption that particles, bubbles, and droplets
can all make good tracers as long as their inertia is small enough. The
selection and accuracy of tracers in future work can be improved by
taking the study’s findings into account. Their findings and the
mathematical model are applicable not only to small particles, but also to
heavier and denser particles. Additionally, their model can be used not
only in the flows of liquids, such as the ocean, but also for clouds in the
atmosphere.